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Why does the boundary between liquid pha...

Why does the boundary between liquid phase and gaseous phase disappear on heating a liquid upto critical temperature in a closed vessel ? In this situation what will be the state of the substance ?

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when the liquid is heated upto critical temperature. The density of the liquid and gaseous phase of a substance become equal. As a result, the liquid passes into the gaseous state continuously and the boundry of separation dissappears. The substance is said to be in the fluid state which includes both the liquid and gaseous states, For details consult section 5.22.
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Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . Which is true about the substance in figure?

Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . If heat is added to solids A and B , each in a container that is open to the atmosphere :-

DINESH PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-Short Answer Type Questions
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  6. Define gaseous state of a substance.

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  7. What is the cause of gas pressure ? How is it measured ?

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  8. The pressure of a gas is 2.5 atm. Calculate the value in torr.

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  9. What is the difference between barometer and manometer?

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  10. BOYLE'S LAW

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  11. In what respect does Gay Lussac's law differ form the Charles's law ...

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  12. What is the equation of state of an ideal gas ? Why is it so called ?

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  14. Calculate the value of R in : (i) SI units , (II) Cal "degree"^(-1)...

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  15. DALTON'S LAW OF PARTIAL PRESSURE

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  16. State the law which relates the rate of diffusion of gases to their d...

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  17. Derive a relation between density and molar mass of the gas.

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  18. How will you justify that the collision among the gas molecules are pe...

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  19. Define most probable speed, average speed and root mean square speed ...

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